无机材料学报 ›› 2021, Vol. 36 ›› Issue (11): 1154-1162.DOI: 10.15541/jim20210076
所属专题: 【能源环境】量子点
收稿日期:
2021-02-05
修回日期:
2021-04-13
出版日期:
2021-11-20
网络出版日期:
2021-04-25
通讯作者:
王晓娟, 副教授. E-mail: xwang@upc.edu.cn
作者简介:
刘 彩(1996-), 女, 硕士研究生. E-mail: liucai662@163.com
基金资助:
LIU Cai(), LIU Fang, HUANG Fang, WANG Xiaojuan(
)
Received:
2021-02-05
Revised:
2021-04-13
Published:
2021-11-20
Online:
2021-04-25
Contact:
WANG Xiaojuan, associate professor. E-mail: xwang@upc.edu.cn
About author:
LIU Cai(1996-), male, Master candidate. E-mail: liucai662@163.com
Supported by:
摘要:
光催化降解技术能够高效去除废水中的有机污染物, 具有广阔的应用前景。本研究以海藻为碳源, 采用微波水热法制备海藻基碳量子点(CDs), 并进一步合成CDs-Cu-TiO2复合材料作为可见光催化剂用于污染物降解。结果表明, 复合材料中CDs、Cu2+与TiO2紧密结合在一起, 可见光区吸收明显增强, 荧光发射效率降低。CDs与Cu2+的引入产生协同效应, 使复合材料的禁带宽度降低到2.35 eV, 并有效抑制了电子-空穴的复合。以罗丹明B为污染物模型的光催化性能实验显示, 海藻基CDs-Cu-TiO2复合材料在可见光照射下降解RhB的一级反应速率常数能够达到纯TiO2纳米颗粒的6.4倍, 150 min降解率接近100%, 是TiO2纳米颗粒的2倍。
中图分类号:
刘彩, 刘芳, 黄方, 王晓娟. 海藻基CDs-Cu-TiO2复合材料的制备及其光催化性能[J]. 无机材料学报, 2021, 36(11): 1154-1162.
LIU Cai, LIU Fang, HUANG Fang, WANG Xiaojuan. Preparation and Photocatalytic Properties of Alga-based CDs-Cu-TiO2 Composite Material[J]. Journal of Inorganic Materials, 2021, 36(11): 1154-1162.
图3 样品(A)TiO2, (B)CDs, (C, D)CDs-Cu-TiO2的TEM照片; (E)CDs-Cu-TiO2的SAED图片; (F)CDs-TiO2和CDs-Cu-TiO2样品的EDS分析
Fig. 3 TEM images of (A) TiO2 , (B) CDs, (C, D) CDs-Cu-TiO2; (E) SAED image of CDs-Cu-TiO2 composite; (F) EDS patterns of CDs-TiO2 and CDs-Cu-TiO2 composite
图4 (A)不同样品的XPS全谱图; CDs-Cu-TiO2的(B)C1s, (C)N1s, (D)Cu2p的高分辨分峰拟合谱
Fig. 4 (A) XPS survey spectra of different materials; XPS spectra of (B) C1s, (C) N1s, and (D) Cu2p for the CDs-Cu-TiO2 composite
图5 复合材料的(A)红外光谱和(B)紫外-可见漫反射光谱
Fig. 5 (A)FT-IR spectra and (B) UV-Vis diffuse reflectance spectra of TiO2, CDs-TiO2 and CDs-Cu-TiO2 composite with inset showing the Tauc’s plots
图6 (A)CDs的紫外-可见吸收光谱和荧光发射光谱(激发波长380 nm); (B)不同近红外波长激发的CDs溶液的荧光光谱; (C)TiO2, CDs-TiO2 和 CDs-Cu-TiO2 样品的荧光光谱(激发波长320 nm)
Fig. 6 (A) UV-Vis absorption spectrum and FL spectrum (λex= 380 nm) of CDs; (B) Photoluminescence emission spectra of CDs at different near infrared excitation wavelengths; (C) FL spectra (λex=320 nm) of TiO2, CDs-TiO2 and CDs-Cu-TiO2 composite
图7 (A)不同配比CDs-TiO2催化剂和(B)不同配比CDs-Cu-TiO2催化剂可见光降解RhB; (C)不同催化剂可见光下降解RhB的一级动力学分析; (D)CDs-Cu-TiO2催化降解RhB的循环实验
Fig. 7 RhB degradation under visible light irradiation using CDs-TiO2 (A) or CDs-Cu-TiO2 (B) as the photocatalyst; (C) the first order kinetics of RhB degradation in the presence of various photocatalysts; (D) recycling runs of the photocatalytic activity of CDs-Cu-TiO2 toward RhB degradation
Atomic content of each element in CDs-Cu-TiO2 | |||||
---|---|---|---|---|---|
Element | Ti2p | C1s | N1s | O1s | Cu2p |
/% | 27.11 | 13.61 | 1.14 | 57.21 | 0.93 |
表1 CDs-Cu-TiO2中各元素的原子含量分析
Table 1 Analysis of the atomic content of each element in CDs-Cu-TiO2 composite
Atomic content of each element in CDs-Cu-TiO2 | |||||
---|---|---|---|---|---|
Element | Ti2p | C1s | N1s | O1s | Cu2p |
/% | 27.11 | 13.61 | 1.14 | 57.21 | 0.93 |
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